Relevant actors in environmental resources disputes base their positions on specific assumptions about growth, science, and nature, and construct narratives to support these positions. The contest over the extension of a sewerage system in Ontario, Canada, illustrates this point. A productivist narrative sees sewers as necessary to meet the competitiveness of the city region and a growing demand for housing. It assumes that science can accommodate local resilient ecologies and human bodies. A nature conservation narrative, by contrast, embraces a conception of no or slow growth, locally integrated water management, and vulnerable ecologies and human bodies. It is, however, compromised by a NIMBY bias, an aesthetic focus on nature, and a continued endorsement of regional growth. We conclude that narratives on growth, science, and nature are not given, but socially produced, historically contingent, strategically deployed, internally compromised, embedded in specific power relations, and open to contestation and challenge.